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marsh gas:see methanemethane
, CH4, colorless, odorless, gaseous saturated hydrocarbon; the simplest alkane. It is less dense than air, melts at −184°C;, and boils at −161.4°C;. It is combustible and can form explosive mixtures with air.
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marsh gas[′märsh ‚gas]
Combustible gas, consisting chiefly of methane, produced as a result of decay of vegetation in stagnant water.
a hydrocarbon gas largely composed of methane formed when organic material decays in the absence of air